The only drugs in his system were of the class that includes marijuana, but that played no part in his death

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Monkees lead singer Davy Jones had severe arterial build-up and died of a heart attack, an autopsy report obtained Thursday by The Associated Press confirmed.

An autopsy report confirms Monkees star Davy Jones died of a heart attack.

The report obtained Thursday by The Associated Press shows the 66-year-old Jones had severe build-up in his arteries.

Toxicology reports came back negative for any sign of drugs in his system other than cannabinoids, a class of drugs that includes marijuana. However, that played no role in his death.

The report also notes some congestion in the singer's lungs.

Rock Stars: Then and Now

Jones rocketed to the top of the 1960s music charts along with his bandmates in The Monkees, captivating audiences with hits including "Daydream Believer" and "I'm a Believer." He died Feb. 29 near his home in Indiantown, Fla.